CN117073869A - Temperature sensing bulb detection circuit and control method - Google Patents

Temperature sensing bulb detection circuit and control method Download PDF

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Publication number
CN117073869A
CN117073869A CN202310984174.5A CN202310984174A CN117073869A CN 117073869 A CN117073869 A CN 117073869A CN 202310984174 A CN202310984174 A CN 202310984174A CN 117073869 A CN117073869 A CN 117073869A
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CN
China
Prior art keywords
thermistor
voltage value
voltage
circuit
controllable switch
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Pending
Application number
CN202310984174.5A
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Chinese (zh)
Inventor
田新
谢四雄
孙磊
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202310984174.5A priority Critical patent/CN117073869A/en
Publication of CN117073869A publication Critical patent/CN117073869A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The application relates to a temperature sensing bulb detection circuit and a control method. The circuit comprises: a first sub-circuit in which a first controllable switch is connected in series with a first thermistor; a second sub-circuit in which a second controllable switch is connected in series with a second thermistor; a third sub-circuit in which a third controllable switch is connected in series with a third thermistor; a fourth sub-circuit comprising a first normally open switch; the first voltage dividing resistor is connected in series with the fifth subcircuit of the third voltage dividing resistor through a first sampling signal node; the second voltage dividing resistor is connected in series with the sixth subcircuit through a second sampling signal node and a fourth voltage dividing resistor; the first sub-circuit, the second sub-circuit, the third sub-circuit and the fourth sub-circuit are connected in parallel to form a first sub-circuit; the fifth sub-circuit and the sixth sub-circuit are connected in parallel to form a second sub-circuit; the first sub-circuit is connected with the second sub-circuit in series and then is connected with a vehicle-mounted direct current power supply; the first sampling signal node and the second sampling signal node are also connected through a second normally open switch. The application can judge the resistance state of the thermistor.

Description

Temperature sensing bulb detection circuit and control method
Technical Field
The application relates to the technical field of fault detection, in particular to a temperature sensing bulb detection circuit and a control method.
Background
Under traditional temperature sensing bag detection, when the temperature sensing bag fault occurs in the operation of the air conditioner, the whole air conditioning unit is usually stopped directly. The thermistor itself is a resistor composed of a single metal material, and the resistance value of the resistor changes with the change of temperature, including a positive temperature coefficient thermistor (PTC) and a negative temperature coefficient thermistor (NTC), and the thermistor is often used for detecting medium and low temperatures. Currently, the existing temperature sensing bulb detection circuit cannot detect whether the thermistor is faulty or not.
Disclosure of Invention
The application provides a temperature sensing bulb detection circuit and a control method, which are used for solving the technical problem that whether a thermistor fails or not cannot be detected in the prior art.
In a first aspect, the present application provides a bulb detection circuit comprising: a first sub-circuit in which a first controllable switch is connected in series with a first thermistor; a second sub-circuit in which a second controllable switch is connected in series with a second thermistor; a third sub-circuit in which a third controllable switch is connected in series with a third thermistor; a fourth sub-circuit comprising a first normally open switch; the first voltage dividing resistor is connected in series with the fifth subcircuit of the third voltage dividing resistor through a first sampling signal node; the second voltage dividing resistor is connected in series with the sixth subcircuit through a second sampling signal node and a fourth voltage dividing resistor; the first sub-circuit, the second sub-circuit, the third sub-circuit and the fourth sub-circuit are connected in parallel to form a first sub-circuit; the fifth sub-circuit and the sixth sub-circuit are connected in parallel to form a second sub-circuit; the first sub-circuit and the second sub-circuit are connected in series and then connected with a vehicle-mounted direct current power supply; the first sampling signal node and the second sampling signal node are also connected through a second normally open switch, and the first sampling signal node and the second sampling signal node are also connected with a micro-control unit controller through a voltage signal acquisition device respectively; the voltage signal acquisition device is used for acquiring voltage values of the first sampling signal node and the second sampling signal node; and the micro-control unit controller is used for determining the states of the first thermistor, the second thermistor and the third thermistor according to the voltage value acquired by the voltage signal acquisition device.
In a second aspect, the present application provides a control method of a temperature sensing bulb detection circuit, where the method is applied to the temperature sensing bulb detection circuit, and the control method of the temperature sensing bulb detection circuit includes: controlling the first normally open switch, the second normally open switch and the third controllable switch to be opened, and controlling the first controllable switch and the second controllable switch to be closed; acquiring a tenth voltage value at the first sampling signal node and an eleventh voltage value at the second sampling signal node through the voltage signal acquisition device; controlling the first normally open switch, the second normally open switch and the first controllable switch to be opened, and controlling the second controllable switch and the third controllable switch to be closed; acquiring a twelfth voltage value at the first sampling signal node and a thirteenth voltage value at the second sampling signal node through the voltage signal acquisition device; controlling the first normally open switch, the second normally open switch and the second controllable switch to be opened, and controlling the first controllable switch and the third controllable switch to be closed; collecting a fourteenth voltage value at the first sampling signal node and a fifteenth voltage value at the second sampling signal node by the voltage signal collecting device; calculating a first parallel resistance value of the first thermistor and the second thermistor after being connected in parallel according to the tenth voltage value and the eleventh voltage value; calculating a second parallel resistance value of the second thermistor and the third thermistor after being connected in parallel according to the twelfth voltage value and the thirteenth voltage value; calculating a third parallel resistance value of the first thermistor and the third thermistor after being connected in parallel according to the fourteenth voltage value and the fifteenth voltage value; and judging whether the first thermistor, the second thermistor and the third thermistor are abnormal or not by using the first parallel resistance, the second parallel resistance and the third parallel resistance.
In an embodiment, the determining whether the first thermistor, the second thermistor, and the third thermistor are abnormal using the first parallel resistance, the second parallel resistance, and the third parallel resistance includes: judging whether the first parallel resistance, the second parallel resistance and the third parallel resistance are within a preset error range or not; and determining whether the first thermistor, the second thermistor and the third thermistor are abnormal according to the judging result.
In an embodiment, the preset error range is determined according to the accuracy of the first thermistor, the second thermistor and the third thermistor.
In an embodiment, the determining whether the first thermistor, the second thermistor, and the third thermistor are abnormal according to the determination result includes: judging that the first thermistor, the second thermistor and the third thermistor are not abnormal under the condition that the first parallel resistance, the second parallel resistance and the third parallel resistance are all in a preset error range; judging that one of the first thermistor, the second thermistor and the third thermistor is abnormal under the condition that one of the first parallel resistance, the second parallel resistance and the third parallel resistance is not in a preset error range; and judging that at least two of the first thermistor, the second thermistor and the third thermistor are abnormal under the condition that at least two of the first parallel resistance, the second parallel resistance and the third parallel resistance are not in a preset error range.
In an embodiment, before collecting the tenth voltage value at the first sampled signal node and the eleventh voltage value at the second sampled signal node, the method further comprises: controlling the first normally open switch to be closed; the second normally open switch, the first controllable switch, the second controllable switch and the third controllable switch are disconnected, and a first voltage value at the first sampling signal node and a second voltage value at the second sampling signal node are acquired through the voltage signal acquisition device; controlling the first normally open switch and the second normally open switch to be closed; the first controllable switch, the second controllable switch and the third controllable switch are disconnected, and a third voltage value at the first sampling signal node is acquired through the voltage signal acquisition device; and comparing the first voltage value, the second voltage value, the third voltage value and a preset value to determine the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor.
In an embodiment, when the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor or the fourth voltage dividing resistor are abnormal, warning information is sent; and detecting the thermistor when the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor are all normal.
In one embodiment, performing thermistor detection includes: controlling the first normally open switch, the second controllable switch and the third controllable switch to be opened, wherein the first controllable switch is closed; collecting a fourth voltage value at the first sampling signal node and a fifth voltage value at the second sampling signal node through the voltage signal collecting device; controlling the first normally open switch, the second normally open switch, the first controllable switch and the third controllable switch to be opened, and controlling the second controllable switch to be closed; collecting a sixth voltage value at the first sampling signal node and a seventh voltage value at the second sampling signal node through the voltage signal collecting device; controlling the first normally open switch, the second normally open switch, the first controllable switch and the second controllable switch to be opened, and controlling the third controllable switch to be closed; acquiring an eighth voltage value at the first sampling signal node and a ninth voltage value at the second sampling signal node through the voltage signal acquisition device; judging whether the first thermistor has a short circuit or open circuit state according to the fourth voltage value and the fifth voltage value; judging whether the second thermistor has a short circuit or open circuit state according to the sixth voltage value and the seventh voltage value; and judging whether the third thermistor has a short circuit or open circuit state according to the eighth voltage value and the ninth voltage value.
In an embodiment, judging whether the first thermistor has a short circuit or open circuit state according to the fourth voltage value and the fifth voltage value; judging whether the second thermistor has a short circuit or open circuit state according to the sixth voltage value and the seventh voltage value; judging whether the third thermistor has a short circuit or open circuit state according to the eighth voltage value and the ninth voltage value, including: judging that the first thermistor has a short circuit state under the condition that the fourth voltage value is the same as the first voltage value and the fifth voltage value is the same as the second voltage value; judging that the first thermistor has an open circuit state under the condition that the fourth voltage value and the fifth voltage value have no voltage value; judging that the second thermistor has a short circuit state under the condition that the sixth voltage value is the same as the first voltage value and the seventh voltage value is the same as the second voltage value; judging that the second thermistor has an open circuit state under the condition that the sixth voltage value and the seventh voltage value have no voltage value; judging that the third thermistor has a short circuit state under the condition that the eighth voltage value is the same as the first voltage value and the ninth voltage value is the same as the second voltage value; and judging that the third thermistor has an open circuit state under the condition that the eighth voltage value and the ninth voltage value have no voltage value.
In one embodiment, an alarm message is sent out when the first thermistor, the second thermistor or the third thermistor is judged to have a short circuit or an open circuit; under the condition that the first thermistor, the second thermistor and the third thermistor are not in a short circuit or open circuit state, executing control of the first normally-open switch, the second normally-open switch and the third controllable switch to be opened, wherein the first controllable switch and the second controllable switch are closed; and acquiring a tenth voltage value at the first sampling signal node and an eleventh voltage value at the second sampling signal node through the voltage signal acquisition device.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: according to the method provided by the embodiment of the application, three thermistor groups are calculated by arranging three thermistor groups in parallel in the circuit and by means of two-to-two switches, and whether the difference value of the three thermistor groups is in an error range is judged, so that the resistance state of the thermistor is judged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural diagram of a temperature sensing bulb detection circuit according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a control method of a temperature sensing bulb detection circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a voltage dividing resistor detection flow provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of a thermistor detection flow according to an embodiment of the present application;
fig. 5 is a schematic diagram of an internal structure of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
In order to solve the technical problem that whether the thermistor fails or not cannot be detected in the prior art, the application provides a temperature sensing bulb detection circuit and a control method, which can judge the resistance state of the thermistor.
Fig. 1 is a schematic structural diagram of a temperature sensing bulb detection circuit according to an embodiment of the present application.
As shown in fig. 1, the bulb detection circuit includes:
a first sub-circuit in which a first controllable switch K1 is connected in series with a first thermistor RT 1; a second sub-circuit in which a second controllable switch K2 is connected in series with a second thermistor RT 2; a third sub-circuit in which a third controllable switch K3 is connected in series with a third thermistor RT 3; a fourth sub-circuit comprising a first normally open switch K; the first voltage dividing resistor R1 is connected in series with the third voltage dividing resistor R3 through a fifth sub-circuit of the first sampling signal node A; the second voltage dividing resistor R2 is connected in series with a sixth subcircuit of the fourth voltage dividing resistor R4 through a second sampling signal node B; the first sub-circuit, the second sub-circuit, the third sub-circuit and the fourth sub-circuit are connected in parallel to form a first sub-circuit; the fifth sub-circuit and the sixth sub-circuit are connected in parallel to form a second sub-circuit; the first sub-circuit and the second sub-circuit are connected in series and then connected with a vehicle-mounted Direct Current (DC) power supply; the first sampling signal node A and the second sampling signal node B are also connected through a second normally open switch K4, and the first sampling signal node A and the second sampling signal node B are also connected with a micro control unit controller MCU through a voltage signal acquisition device H respectively; the voltage signal acquisition device H is used for acquiring voltage values of the first sampling signal node A and the second sampling signal node B; the micro control unit controller MCU is used for determining states of the first thermistor RT1, the second thermistor RT2 and the third thermistor RT3 according to the voltage value acquired by the voltage signal acquisition device H.
Based on the above-mentioned thermal bulb detection circuit, the embodiment also provides a control method of the thermal bulb detection circuit, the method is applied to the above-mentioned thermal bulb detection circuit, and the control method of the thermal bulb detection circuit includes: controlling the first normally open switch to be closed; the second normally open switch, the first controllable switch, the second controllable switch and the third controllable switch are disconnected, and a first voltage value at the first sampling signal node and a second voltage value at the second sampling signal node are acquired through the voltage signal acquisition device; controlling the first normally open switch and the second normally open switch to be closed; the first controllable switch, the second controllable switch and the third controllable switch are disconnected, and a third voltage value at the first sampling signal node is acquired through the voltage signal acquisition device; and comparing the first voltage value, the second voltage value, the third voltage value and a preset value to determine the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor.
Sending out warning information under the condition that the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor or the fourth voltage dividing resistor are abnormal; and detecting the thermistor when the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor are all normal.
Specifically, according to the first voltage value and the second voltage value, the following formula may be used for calculation:
wherein U is 1 At a first voltage value, U 2 At a second voltage value, U DC Voltage value R provided for vehicle-mounted direct current power supply 1 Is the resistance value of the first voltage dividing resistor, R 2 Is the resistance value of the second voltage-dividing resistor, R 3 R is the resistance of the third voltage dividing resistor 4 The resistance of the fourth voltage dividing resistor.
From the third voltage value, the calculation can be performed using the following formula:
wherein U is 3 At a third voltage value, U DC Voltage value R provided for vehicle-mounted direct current power supply 1 Is the resistance value of the first voltage dividing resistor, R 2 Is the resistance value of the second voltage-dividing resistor, R 3 R is the resistance of the third voltage dividing resistor 4 The resistance of the fourth voltage dividing resistor.
Namely, in the embodiment, the resistance states (open circuit, bigger, normal, smaller and short circuit) of 4 voltage dividing resistors can be judged by comparing the measured ratio of the resistance values of R1, R3, R2 and R4 with the ratio of the parallel resistance values of R1, R2 and the parallel resistance values of R3 and R4 and substituting the ratio with preset values stored in an MCU microprocessor, and when the resistance values are abnormal, warning information is reported and the temperature sensing bag works in fault; and if the resistance is normal, detecting the thermistor.
Here, to avoid the possibility of occurrence of an accidental situation, the four voltage dividing resistors should be resistors with different resistance values but similar resistance values as much as possible, and the sum of the resistance values of R1 and R3 should be equal to the sum of the resistance values of R2 and R4.
In one embodiment, performing thermistor detection includes: controlling the first normally open switch, the second controllable switch and the third controllable switch to be opened, wherein the first controllable switch is closed; collecting a fourth voltage value at the first sampling signal node and a fifth voltage value at the second sampling signal node through the voltage signal collecting device; controlling the first normally open switch, the second normally open switch, the first controllable switch and the third controllable switch to be opened, and controlling the second controllable switch to be closed; collecting a sixth voltage value at the first sampling signal node and a seventh voltage value at the second sampling signal node through the voltage signal collecting device; controlling the first normally open switch, the second normally open switch, the first controllable switch and the second controllable switch to be opened, and controlling the third controllable switch to be closed; acquiring an eighth voltage value at the first sampling signal node and a ninth voltage value at the second sampling signal node through the voltage signal acquisition device; judging whether the first thermistor has a short circuit or open circuit state according to the fourth voltage value and the fifth voltage value; judging whether the second thermistor has a short circuit or open circuit state according to the sixth voltage value and the seventh voltage value; and judging whether the third thermistor has a short circuit or open circuit state according to the eighth voltage value and the ninth voltage value.
Specifically, when the fourth voltage value is the same as the first voltage value and the fifth voltage value is the same as the second voltage value, judging that the first thermistor has a short circuit state; judging that the first thermistor has an open circuit state under the condition that the fourth voltage value and the fifth voltage value have no voltage value; judging that the second thermistor has a short circuit state under the condition that the sixth voltage value is the same as the first voltage value and the seventh voltage value is the same as the second voltage value; judging that the second thermistor has an open circuit state under the condition that the sixth voltage value and the seventh voltage value have no voltage value; judging that the third thermistor has a short circuit state under the condition that the eighth voltage value is the same as the first voltage value and the ninth voltage value is the same as the second voltage value; and judging that the third thermistor has an open circuit state under the condition that the eighth voltage value and the ninth voltage value have no voltage value.
Sending alarm information under the condition that the first thermistor, the second thermistor or the third thermistor is judged to have a short circuit or an open circuit; and detecting a thermistor state under the condition that the first thermistor, the second thermistor and the third thermistor are not in a short circuit or open circuit state.
Namely, in the present embodiment, when the thermistor is detected, the switch K, K is turned off; sequentially closing the opening switches K1, K2 and K3, judging whether three thermistors are in a short circuit or open circuit state according to the resistance values of the voltage dividing resistors determined in the steps, and feeding back a short circuit signal when the thermistors are in a short circuit state, wherein the total resistance value calculated by voltage sampling is the same as the resistance value measured by the opening switch K4; when the circuit breaking occurs, the voltage acquisition fails, and a circuit breaking signal is fed back. When short circuit and open circuit occur, the system sends out alarm reminding. When all three thermistors are of a measurable resistance, the state of the thermistor can be detected.
In one embodiment, referring to fig. 2, the detecting the thermistor state includes:
step 201: controlling the first normally open switch, the second normally open switch and the third controllable switch to be opened, and controlling the first controllable switch and the second controllable switch to be closed; acquiring a tenth voltage value at the first sampling signal node and an eleventh voltage value at the second sampling signal node through the voltage signal acquisition device;
step 202: controlling the first normally open switch, the second normally open switch and the first controllable switch to be opened, and controlling the second controllable switch and the third controllable switch to be closed; acquiring a twelfth voltage value at the first sampling signal node and a thirteenth voltage value at the second sampling signal node through the voltage signal acquisition device;
Step 203: controlling the first normally open switch, the second normally open switch and the second controllable switch to be opened, and controlling the first controllable switch and the third controllable switch to be closed; collecting a fourteenth voltage value at the first sampling signal node and a fifteenth voltage value at the second sampling signal node by the voltage signal collecting device;
step 204: calculating a first parallel resistance value of the first thermistor and the second thermistor after being connected in parallel according to the tenth voltage value and the eleventh voltage value; calculating a second parallel resistance value of the second thermistor and the third thermistor after being connected in parallel according to the twelfth voltage value and the thirteenth voltage value; calculating a third parallel resistance value of the first thermistor and the third thermistor after being connected in parallel according to the fourteenth voltage value and the fifteenth voltage value;
step 205: and judging whether the first thermistor, the second thermistor and the third thermistor are abnormal or not by using the first parallel resistance, the second parallel resistance and the third parallel resistance.
Specifically, it may be determined whether the first parallel resistance, the second parallel resistance, and the third parallel resistance are within a preset error range; and determining whether the first thermistor, the second thermistor and the third thermistor are abnormal according to the judging result.
Here, the preset error range may be determined according to the accuracy of the first, second, and third thermistors.
That is, in an embodiment, when the first parallel resistance, the second parallel resistance, and the third parallel resistance are all within a preset error range, it is determined that the first thermistor, the second thermistor, and the third thermistor are not abnormal; judging that one of the first thermistor, the second thermistor and the third thermistor is abnormal under the condition that one of the first parallel resistance, the second parallel resistance and the third parallel resistance is not in a preset error range; and judging that at least two of the first thermistor, the second thermistor and the third thermistor are abnormal under the condition that at least two of the first parallel resistance, the second parallel resistance and the third parallel resistance are not in a preset error range.
In the embodiment, when determining the state of no short circuit or open circuit of the thermistor, detection is performed: the switch K4 is normally open, and the switches K1K2, K2K3 and K1K3 are sequentially closed; and obtaining the parallel resistance values of the three groups of thermistors, and comparing the three groups of parallel resistance values in the MCU microprocessor.
If the three groups of parallel resistances are all in the error range, the error range is determined according to the precision of the thermistor, the thermistor is free from abnormality, and any thermistor can be used for detection when the temperature sensing bulb operates;
if the two groups of parallel resistances have little difference, one group of parallel resistances exceeds the error range of the other two groups of parallel resistances, which indicates that one thermistor has resistance deviation, so that the two groups of parallel resistances deviate from the other group of normal parallel resistances, at the moment, a circuit which is different from the two groups of parallel resistances can be selected as a detection circuit of the temperature sensing bulb, poor detection of the temperature sensing bulb is sent to passengers of the vehicle, detection information is sent to after-sales maintenance parts, and the temperature sensing bulb with faults can be maintained timely;
if the three groups of parallel resistances in the circuit are large in phase difference, it is indicated that at least two thermistors in the detection circuit have resistance deviation, detection of the temperature sensing bag is basically invalid, a temperature sensing bag fault signal is sent, a distress signal is sent to a nearest maintenance station of the vehicle, and driving safety of passengers of the vehicle is guaranteed.
According to the embodiment, the resistance values of the resistors in the circuit can be detected completely, when the state of the detected resistance values is abnormal, the system can send out corresponding early warning information according to different detected states, a good prevention effect is achieved, and the safety of drivers is guaranteed.
According to the temperature sensing bulb detection circuit and the control method provided by the embodiment of the invention, the resistance state of the voltage dividing resistor is judged through the action of the switch, and whether the thermistor detection circuit can be continued is confirmed according to the state of the voltage dividing resistor. Under the condition that the thermistor detection circuit can continue to operate, the voltage-dividing resistance value detected by the thermistor can be effectively calculated through the switching action of the control switch, the obtained accurate voltage-dividing resistance value is participated in the calculation of the thermistor value, the accuracy of the calculated thermistor value can be ensured, three thermistor groups are parallelly connected through the arrangement of three thermistor groups in the circuit, three thermistor groups are calculated through the mode of two switches, and whether the difference value of the three thermistor groups is in an error range or not is judged, so that the resistance state of the thermistor is judged.
The following describes the embodiment in detail based on a practical application scenario.
The embodiment provides a temperature sensing bulb fault detection system and a control method thereof. Mainly solves the following problems:
(1) When the voltage dividing resistor leaves the factory, the resistance value and the actual value deviate due to individual difference.
(2) After the resistance value of the voltage dividing resistor is in error under the conditions of aging and the like, the circuit cannot judge the resistance value in time through the preset resistance value, and warning information is sent out for the resistor with the error.
(3) Aiming at the situations that after the resistance value of the thermistor is abnormal, the temperature sensing bag reports faults, after-sale inspection cannot accurately determine the cause of the faults and the like.
Referring to fig. 3 and 4, the detection principle of the present embodiment is as follows:
a first part: verification of voltage dividing resistor resistance
(1) Closing a switch K, opening a K4, and measuring the voltage of R3 and R4 according to the known direct current power supply voltage to obtain the resistance ratio of R1, R3, R2 and R4 respectively;
wherein U is 1 At a first voltage value, U 2 At a second voltage value, U DC Voltage value R provided for vehicle-mounted direct current power supply 1 Is the resistance value of the first voltage dividing resistor, R 2 Is the resistance value of the second voltage-dividing resistor, R 3 R is the resistance of the third voltage dividing resistor 4 The resistance of the fourth voltage dividing resistor.
(2) Closing K4, and measuring the ratio of the parallel resistance of R1 and R2 to the parallel resistance of R3 and R4, wherein the collected values of the sampling signal 1 and the sampling signal 2 are the same, namely u1=u2;
wherein U is 3 At a third voltage value, U DC Voltage value R provided for vehicle-mounted direct current power supply 1 Is the resistance value of the first voltage dividing resistor, R 2 Is the resistance value of the second voltage-dividing resistor, R 3 R is the resistance of the third voltage dividing resistor 4 The resistance of the fourth voltage dividing resistor.
(3) The resistance values of the 4 voltage dividing resistors (open circuit, bigger, normal, smaller and short circuit) can be judged by comparing the measured ratio of the resistance values of R1, R3, R2 and R4 with the ratio of the parallel resistance values of R1 and R2 to the parallel resistance values of R3 and R4 and substituting the ratio with preset values stored in an MCU microprocessor, and when the resistance values are abnormal, warning information is reported, and the temperature sensing bag works in fault; and if the resistance is normal, detecting the thermistor.
Here, to avoid the possibility of occurrence of an accidental situation, the four voltage dividing resistors should be resistors with different resistance values but similar resistance values as much as possible, and the sum of the resistance values of R1 and R3 should be equal to the sum of the resistance values of R2 and R4.
A second part: thermistor resistance verification
(1) When the thermistor is detected, the switch K, K is turned off; sequentially closing the opening switches K1, K2 and K3, judging whether three thermistors are in a short circuit or off state according to the resistance values of the voltage dividing resistors determined in step 2, and feeding back a short circuit signal when the thermistors are in a short circuit state, wherein the total resistance value calculated by voltage sampling is the same as the resistance value measured by the opening switch K4 in step 2; when the circuit breaking occurs, the voltage acquisition fails, and a circuit breaking signal is fed back. When short circuit and open circuit occur, the system sends out alarm reminding. When all three thermistors are of measurable resistance, the three thermistors enter a thermistor detection circuit.
(2) Detecting by determining the state of no short circuit or open circuit of the thermistor in the step (1): the switch K4 is normally open, and the switches K1K2, K2K3 and K1K3 are sequentially closed; and obtaining the parallel resistance values of the three groups of thermistors, and comparing the three groups of parallel resistance values in the MCU microprocessor.
If the three groups of parallel resistances are all in the error range, the error range is determined according to the precision of the thermistor, the thermistor is free from abnormality, and any thermistor can be used for detection when the temperature sensing bulb operates;
If the two groups of parallel resistances have little difference, one group of parallel resistances exceeds the error range of the other two groups of parallel resistances, which indicates that one thermistor has resistance deviation, so that the two groups of parallel resistances deviate from the other group of normal parallel resistances, at the moment, a circuit which is different from the two groups of parallel resistances can be selected as a detection circuit of the temperature sensing bulb, poor detection of the temperature sensing bulb is sent to passengers of the vehicle, detection information is sent to after-sales maintenance parts, and the temperature sensing bulb with faults can be maintained timely;
if the three groups of parallel resistances in the circuit are large in phase difference, it is indicated that at least two thermistors in the detection circuit have resistance deviation, detection of the temperature sensing bag is basically invalid, a temperature sensing bag fault signal is sent, a distress signal is sent to a nearest maintenance station of the vehicle, and driving safety of passengers of the vehicle is guaranteed.
The detection circuit can be placed on the main control board to be used as a preset circuit, and can also be placed near the temperature sensing bag. The detection circuit can perform self-checking operation, the temperature sensing bag is detected at intervals in the starting or running process of the vehicle, and if the fault is detected, the display screen sends out alarm information to carry out warning.
Through the steps, the resistance values of the resistors in the circuit can be detected completely, when the state of the detected resistance values is abnormal, the system can send out corresponding early warning information according to different detected states, the prevention effect can be good, and the safety of drivers is ensured.
The invention point of this embodiment is as follows:
(1) The detection circuit of the thermistor is provided, the voltage dividing resistance value detected by the thermistor can be effectively and accurately calculated through the switching action of the control switch, the obtained accurate voltage dividing resistance value is participated in the calculation of the thermistor value, and the accuracy of the calculated thermistor value can be ensured.
(2) The state of the voltage dividing resistor (open circuit, bigger, normal, smaller, short circuit) is judged by the action of the switch, and whether the thermistor detection circuit can be continued is confirmed by judging the state of the obtained voltage dividing resistor.
(3) And after confirming that the voltage dividing resistor is normal, calculating the thermistor value, wherein three paths of thermistors are arranged in the circuit in parallel, calculating three groups of thermistor values in a two-to-two switching mode, and judging whether the difference value of the three groups of thermistor values is in an error range or not, so that the resistance state of the thermistor is judged.
The embodiment has the following beneficial effects:
(1) By verifying the resistance of the divider resistor, the accuracy of the resistance of the divider resistor and the accuracy of the resistor in the calculation of the resistance of the thermistor can be ensured.
(2) And comparing the thermistor resistance value obtained in the detection circuit with a parameter value set in advance by a system, so as to judge the working state of the thermistor, and giving an alarm to the thermistor with problems, thereby improving the accuracy of temperature sensing bulb detection and the safety of riding of the vehicle.
The temperature sensing bulb detection circuit in the air conditioner can be applied to the temperature sensing bulb detection circuit, the traditional temperature sensing bulb detection circuit is not used for detecting the thermistor, the resistance value of the thermistor is deviated under the conditions of long-term operation or environmental disqualification and the like of a unit, the accuracy of temperature sensing bulb detection is reduced, furthermore, the thermistor is directly failed, the unit is stopped, and when the temperature sensing bulb fails, the failure cause can not be accurately locked, so that the unit can be determined after investigation.
According to the embodiment, the accurate value of the voltage dividing resistor is detected, so that the resistance of the thermistor is more accurate, and more accurate temperature change is obtained.
To implement the method of the embodiments of the present invention, the embodiments of the present invention also provide a computer program product comprising computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the steps of the method described above.
As shown in fig. 5, an embodiment of the present application provides an electronic device including a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 perform communication with each other through the communication bus 114,
a memory 113 for storing a computer program;
in one embodiment of the present application, the processor 111 is configured to implement the method provided in any of the foregoing method embodiments when executing the program stored on the memory 113.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash memory (flashRAM). Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transshipment) such as modulated data signals and carrier waves.
It will be appreciated that the memory of embodiments of the invention may be either volatile memory or nonvolatile memory, and may include both volatile and nonvolatile memory. Wherein the nonvolatile Memory may be Read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory described by embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A bulb detection circuit, the bulb detection circuit comprising:
a first sub-circuit in which a first controllable switch is connected in series with a first thermistor; a second sub-circuit in which a second controllable switch is connected in series with a second thermistor; a third sub-circuit in which a third controllable switch is connected in series with a third thermistor; a fourth sub-circuit comprising a first normally open switch; the first voltage dividing resistor is connected in series with the fifth subcircuit of the third voltage dividing resistor through a first sampling signal node; the second voltage dividing resistor is connected in series with the sixth subcircuit through a second sampling signal node and a fourth voltage dividing resistor; the first sub-circuit, the second sub-circuit, the third sub-circuit and the fourth sub-circuit are connected in parallel to form a first sub-circuit; the fifth sub-circuit and the sixth sub-circuit are connected in parallel to form a second sub-circuit; the first sub-circuit and the second sub-circuit are connected in series and then connected with a vehicle-mounted direct current power supply; the first sampling signal node and the second sampling signal node are also connected through a second normally open switch, and the first sampling signal node and the second sampling signal node are also connected with a micro-control unit controller through a voltage signal acquisition device respectively;
The voltage signal acquisition device is used for acquiring voltage values of the first sampling signal node and the second sampling signal node;
and the micro-control unit controller is used for determining the states of the first thermistor, the second thermistor and the third thermistor according to the voltage value acquired by the voltage signal acquisition device.
2. A control method of a bulb detection circuit, wherein the method is applied to the bulb detection circuit according to claim 1, the control method of the bulb detection circuit comprising:
controlling the first normally open switch, the second normally open switch and the third controllable switch to be opened, and controlling the first controllable switch and the second controllable switch to be closed; acquiring a tenth voltage value at the first sampling signal node and an eleventh voltage value at the second sampling signal node through the voltage signal acquisition device;
controlling the first normally open switch, the second normally open switch and the first controllable switch to be opened, and controlling the second controllable switch and the third controllable switch to be closed; acquiring a twelfth voltage value at the first sampling signal node and a thirteenth voltage value at the second sampling signal node through the voltage signal acquisition device;
Controlling the first normally open switch, the second normally open switch and the second controllable switch to be opened, and controlling the first controllable switch and the third controllable switch to be closed; collecting a fourteenth voltage value at the first sampling signal node and a fifteenth voltage value at the second sampling signal node by the voltage signal collecting device;
calculating a first parallel resistance value of the first thermistor and the second thermistor after being connected in parallel according to the tenth voltage value and the eleventh voltage value; calculating a second parallel resistance value of the second thermistor and the third thermistor after being connected in parallel according to the twelfth voltage value and the thirteenth voltage value; calculating a third parallel resistance value of the first thermistor and the third thermistor after being connected in parallel according to the fourteenth voltage value and the fifteenth voltage value;
and judging whether the first thermistor, the second thermistor and the third thermistor are abnormal or not by using the first parallel resistance, the second parallel resistance and the third parallel resistance.
3. The method of claim 2, wherein determining whether the first thermistor, the second thermistor, and the third thermistor are abnormal using the first parallel resistance, the second parallel resistance, and the third parallel resistance, comprises:
Judging whether the first parallel resistance, the second parallel resistance and the third parallel resistance are within a preset error range or not;
and determining whether the first thermistor, the second thermistor and the third thermistor are abnormal according to the judging result.
4. The bulb detection circuit control method of claim 3, wherein the predetermined error range is determined based on the accuracy of the first, second, and third thermistors.
5. The bulb detection circuit control method according to claim 3, wherein the determining whether the first thermistor, the second thermistor, and the third thermistor are abnormal according to the determination result includes:
judging that the first thermistor, the second thermistor and the third thermistor are not abnormal under the condition that the first parallel resistance, the second parallel resistance and the third parallel resistance are all in a preset error range;
judging that one of the first thermistor, the second thermistor and the third thermistor is abnormal under the condition that one of the first parallel resistance, the second parallel resistance and the third parallel resistance is not in a preset error range;
And judging that at least two of the first thermistor, the second thermistor and the third thermistor are abnormal under the condition that at least two of the first parallel resistance, the second parallel resistance and the third parallel resistance are not in a preset error range.
6. The bulb detection circuit control method of claim 2, wherein prior to collecting a tenth voltage value at the first sampled signal node and an eleventh voltage value at the second sampled signal node, the method further comprises:
controlling the first normally open switch to be closed; the second normally open switch, the first controllable switch, the second controllable switch and the third controllable switch are disconnected, and a first voltage value at the first sampling signal node and a second voltage value at the second sampling signal node are acquired through the voltage signal acquisition device;
controlling the first normally open switch and the second normally open switch to be closed; the first controllable switch, the second controllable switch and the third controllable switch are disconnected, and a third voltage value at the first sampling signal node is acquired through the voltage signal acquisition device;
And comparing the first voltage value, the second voltage value, the third voltage value and a preset value to determine the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor.
7. The control method according to claim 6, wherein when the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor, or the fourth voltage dividing resistor are abnormal, a warning message is sent;
and detecting the thermistor when the resistance states of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor are all normal.
8. The method of claim 7, wherein performing thermistor detection comprises:
controlling the first normally open switch, the second controllable switch and the third controllable switch to be opened, wherein the first controllable switch is closed; collecting a fourth voltage value at the first sampling signal node and a fifth voltage value at the second sampling signal node through the voltage signal collecting device;
Controlling the first normally open switch, the second normally open switch, the first controllable switch and the third controllable switch to be opened, and controlling the second controllable switch to be closed; collecting a sixth voltage value at the first sampling signal node and a seventh voltage value at the second sampling signal node through the voltage signal collecting device;
controlling the first normally open switch, the second normally open switch, the first controllable switch and the second controllable switch to be opened, and controlling the third controllable switch to be closed; acquiring an eighth voltage value at the first sampling signal node and a ninth voltage value at the second sampling signal node through the voltage signal acquisition device;
judging whether the first thermistor has a short circuit or open circuit state according to the fourth voltage value and the fifth voltage value; judging whether the second thermistor has a short circuit or open circuit state according to the sixth voltage value and the seventh voltage value; and judging whether the third thermistor has a short circuit or open circuit state according to the eighth voltage value and the ninth voltage value.
9. The bulb detection circuit control method according to claim 8, wherein whether the first thermistor has a short circuit or an open circuit is judged according to the fourth voltage value and the fifth voltage value; judging whether the second thermistor has a short circuit or open circuit state according to the sixth voltage value and the seventh voltage value; judging whether the third thermistor has a short circuit or open circuit state according to the eighth voltage value and the ninth voltage value, including:
Judging that the first thermistor has a short circuit state under the condition that the fourth voltage value is the same as the first voltage value and the fifth voltage value is the same as the second voltage value; judging that the first thermistor has an open circuit state under the condition that the fourth voltage value and the fifth voltage value have no voltage value;
judging that the second thermistor has a short circuit state under the condition that the sixth voltage value is the same as the first voltage value and the seventh voltage value is the same as the second voltage value; judging that the second thermistor has an open circuit state under the condition that the sixth voltage value and the seventh voltage value have no voltage value;
judging that the third thermistor has a short circuit state under the condition that the eighth voltage value is the same as the first voltage value and the ninth voltage value is the same as the second voltage value; and judging that the third thermistor has an open circuit state under the condition that the eighth voltage value and the ninth voltage value have no voltage value.
10. The bulb detection circuit control method according to claim 8, wherein an alarm message is issued when it is determined that the first thermistor, the second thermistor, or the third thermistor has a short circuit or an open circuit;
Under the condition that the first thermistor, the second thermistor and the third thermistor are not in a short circuit or open circuit state, executing control of the first normally-open switch, the second normally-open switch and the third controllable switch to be opened, wherein the first controllable switch and the second controllable switch are closed; collecting a tenth voltage value at the first sampling signal node and an eleventh voltage value at the second sampling signal node by the voltage signal collecting device 。
CN202310984174.5A 2023-08-04 2023-08-04 Temperature sensing bulb detection circuit and control method Pending CN117073869A (en)

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Application Number Priority Date Filing Date Title
CN202310984174.5A CN117073869A (en) 2023-08-04 2023-08-04 Temperature sensing bulb detection circuit and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310984174.5A CN117073869A (en) 2023-08-04 2023-08-04 Temperature sensing bulb detection circuit and control method

Publications (1)

Publication Number Publication Date
CN117073869A true CN117073869A (en) 2023-11-17

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